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<html lang="en">
<head>
    <meta name="viewport" content="width=device-width, initial-scale=1" charset="UTF-8">
    <title>Title</title>
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<body>
<div id="header" class="navbar navbar-expand navbar-dark flex-column flex-md-row bd-navbar"></div>

coding

</body>
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<script>
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</script>
</html>
